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x in (-oo:+oo)
(1/5)*x+(1/3)*y = 2 // - 2
(1/5)*x+(1/3)*y-2 = 0
1/5*x+1/3*y-2 = 0 // - 1/3*y-2
1/5*x = -(1/3*y-2) // : 1/5
x = (-(1/3*y-2))/1/5
x = 5*(2-(1/3*y))
x = 5*(2-(1/3*y))
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